998.
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99875
The largest Roman numeral number that can be made without using a bar is 3,999, which is represented by the letters MMMCMXCIX.
The Egyptians wrote numbers using the Arabic numeral system (our system) and the Romans used the Roman numeral system. (IVXLCDM)
66421
Using the accepted convention, MMMCMXCIX (3999) is the largest numeral. The accepted convention does not permit any symbol to repeat more than three times in succession.